Derek,
The worms use a miniature ball bearing because this type of bearing can be used to carry both radial and axial loads. Needle roller bearings are only really used to carry a radial load. Losmandy uses two kinds of cylindrical roller bearings each designed and located to carry loads in the direction for the bearing design used.?
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Chip Louie Chief Daydreamer Imagination Hardware?
? ?Astropheric Weather Forecast - South Pasadena, CA?
Chip Louie